改进Prewitt算子对高压输电线图像边缘检测

Improved Prewitt operator for edge detection of high-voltage transmission line image

传统的Prewitt算子需要通过人工判别来选取阈值,算子模板方向过于简单,这样会造成边缘选取粗略,定位不准确。为此,提出一种改进Prewitt算子,实现了动态阈值选取,同时增加了Prewitt算子方向模板,使边缘选取更完整,定位更加准确。利用改进后的Prewitt算子对高压输电线异物悬挂图像进行边缘检测仿真实验,实验结果表明,改进后的Prewitt算子解决了传统Prewitt算子对边缘选取粗略的缺点,对于高压输电线路图像边缘检测更精准。

The traditional Prewitt operator needs to choose threshold value manually.The operator template direction is too simple,which will result in rough edge selection and inaccurate positioning.Therefore,an improved Prewitt operator is proposed to realize dynamic threshold selection.At the same time,the direction template of Prewitt operator is increased,so that the edge selection is more complete and the positioning is more accurate.The improved Prewitt operator is used to detect the edge of the hanging image of foreign body in the high voltage transmission line.The experimental results show that the improved Prewitt operator solves the shortcomings of the traditional Prewitt operator in rough edge selection,and the edge detection of the high voltage transmission line image is more accurate.